A recent salmonella outbreak has infected 73 people across 22 states. So far 15 people have Grayson  Prestonbeen hospitalized from the illness, according to the Centers for Disease Control and Prevention.

The true number of sick people from this outbreak is likely much higher and may not be limited to the states with known illnesses, the CDC reported.

The CDC issued a food safety alert for some of Gills Onions diced onion products linked to the salmonella outbreak. Gills Onions voluntarily recalled their branded fresh diced onions because of the potential health risk.

Which products were recalled?

Recalled products include the following:

• Diced yellow onions (3-pound bags and 8-ounce cups)
• Diced celery and onions (8-ounce cups)
• Diced mirepoix (10-ounce cups)
• Diced red onions (8-ounce cups)

The affected products had sell-by dates between August 8 and August 28. While they are no longer being sold in stores, the CDC recommends double checking freezers and refrigerators for any of these products.

Where did the salmonella outbreak occur?

The recalled Gills Onions products were sold in grocery stores, and sent to some restaurants and other institutions in the U.S. and Canada, according to the CDC. One cluster of the salmonella outbreak was identified in a long-term care facility.

California and Utah had reported the largest number of salmonella cases, with 17 outbreaks each.

What are symptoms of salmonella?

The CDC advises those concerned with potential salmonella contamination to be on the lookout for the following symptoms:

• Blood diarrhea or diarrhea that lasts more than three days without improving.
• Diarrhea and a fever over 102 degrees Fahrenheit.
• Excessive vomiting, especially if it prevents you from keeping liquids down.
• Signs of dehydration, including: dry mouth and throat, infrequent peeing and feeling dizzy when standing up.
• Stomach cramps  

These symptoms most commonly occur between six hours and six days after exposure. Though most people recover in four to seven days, those with weakened immune systems, including children younger than 5 and adults over 65, may experience more severe symptoms that require medical treatment or hospitalization.